Hanna v. Plumer
When a Federal Rule of Civil Procedure directly conflicts with a state law on the same subject, does the federal rule or the state law govern in a federal diversity case?
The Decision
9-0 decision · Opinion by Earl Warren · 1965
Majority Opinion— Earl Warrenconcurring ↓
The Supreme Court reversed the lower courts in a unanimous decision (9–0 on the judgment), with Chief Justice Earl Warren writing the opinion for the majority. The Court held that Federal Rule of Civil Procedure 4(d)(1) governed service of process in this diversity case, and that Hanna's service on Plumer's wife at his residence was therefore valid. The Massachusetts in-hand service statute did not apply.
The Court's reasoning rested on an important distinction that had become muddled in lower courts. Chief Justice Warren explained that there are really two different questions that can arise when state and federal practices diverge in diversity cases. The first question — addressed by the Erie doctrine and its progeny like Guaranty Trust — arises when there is no federal statute or Federal Rule directly on point, and a federal court must decide whether to follow a state rule or some informal federal judicial practice. In that situation, the court should ask whether ignoring the state rule would lead to 'forum shopping' (plaintiffs choosing federal court just to gain a procedural advantage) or the 'inequitable administration of the laws' (similarly situated people receiving different treatment depending on which court they end up in). These are the 'twin aims of Erie.'
The second question — which was actually the question in this case — arises when a valid Federal Rule of Civil Procedure directly covers the disputed point. When that happens, the Court explained, the analysis is entirely different. The court should ask whether the Federal Rule is valid under the Rules Enabling Act (the federal statute that authorizes the Supreme Court to promulgate the Federal Rules) and the Constitution. Under the Rules Enabling Act, a Federal Rule is valid as long as it is 'rationally capable of classification' as procedural and does not 'abridge, enlarge, or modify' any substantive right. The Court found that Rule 4(d)(1), which governed how to deliver lawsuit papers to a defendant, was clearly procedural and constitutionally valid. Therefore, it controlled.
The Court sharply criticized the mechanical application of the 'outcome-determinative' test that the lower courts had used. Chief Justice Warren pointed out that if taken to its logical extreme, virtually every procedural difference — down to the color of the paper used in court filings — could be called 'outcome-determinative' in some scenario. The test was never meant to swallow the entire body of federal procedural rules. The correct approach, the Court emphasized, was to recognize that Congress had given federal courts the power to regulate their own procedure, and a properly enacted Federal Rule should not be displaced simply because a state has a different rule on the same topic.
Concurring Opinions
Justice John Marshall Harlan II concurred in the judgment but wrote separately to express concern that the majority's framework was too permissive and could allow federal procedural rules to override state laws that serve important substantive purposes. Harlan argued that instead of simply asking whether a Federal Rule is technically valid under the Rules Enabling Act, courts should also consider whether the state rule is so 'bound up with' the state-created rights and obligations at stake that applying the federal rule would significantly affect the character of those rights — a more nuanced, policy-sensitive approach to protecting the balance between state and federal interests.
Background & Facts
Margarethe Hanna, a citizen of Ohio, was injured in an automobile accident in South Carolina. She believed the driver at fault was connected to the estate of Louise Plumer Osgood, a deceased Massachusetts citizen. Hanna filed a lawsuit in the United States District Court for the District of Massachusetts against Charles Plumer, the executor (the person legally responsible for managing) Osgood's estate. Because Hanna and Plumer were citizens of different states, the federal court had jurisdiction based on 'diversity of citizenship' — a rule that allows people from different states to use federal courts to resolve disputes.
The legal trouble began not with the substance of the accident claim, but with how Hanna delivered the lawsuit papers to Plumer. Her process server left copies of the summons and the complaint at Plumer's residence with his wife, which was a perfectly acceptable method of service under Federal Rule of Civil Procedure 4(d)(1). However, a Massachusetts state statute — Massachusetts General Laws Chapter 197, Section 9 — required that when suing the executor of a deceased person's estate, the legal papers had to be delivered directly into the executor's hands, known as 'in-hand' service. Plumer argued the lawsuit should be thrown out because Hanna had not complied with the stricter Massachusetts rule.
The District Court sided with Plumer. Relying on the principle established by the Supreme Court in earlier cases that federal courts hearing diversity cases should generally follow state law when the choice of rule could affect the outcome of the case, the trial judge concluded that the Massachusetts in-hand service requirement was 'outcome-determinative' — meaning that failing to follow it could change who wins and who loses. The court therefore granted summary judgment in Plumer's favor, effectively ending Hanna's case. The United States Court of Appeals for the First Circuit affirmed this decision on the same reasoning.
Hanna appealed to the Supreme Court, which agreed to hear the case. The core issue was a significant unresolved tension in federal civil procedure: when a valid Federal Rule of Civil Procedure directly addresses a procedural question — here, the proper method for serving someone with a lawsuit — does it give way to a conflicting state law simply because the case is in federal court on diversity grounds? The answer would clarify how federal courts should navigate conflicts between federal procedural rules and state laws, a question with enormous practical implications for every diversity case filed in the country.
The Arguments
Hanna argued that she had properly served Plumer under Federal Rule of Civil Procedure 4(d)(1), which explicitly permitted leaving the summons and complaint at a defendant's dwelling with a person of suitable age. Because a valid federal rule directly covered the method of service, it should govern in federal court regardless of any contrary state law.
- Federal Rule of Civil Procedure 4(d)(1) explicitly authorized the method of service she used — leaving papers at the defendant's residence with a responsible person living there
- The Federal Rules of Civil Procedure were enacted by Congress through the Rules Enabling Act and carry the force of federal law, meaning a conflicting state rule cannot override them
- The lower courts misapplied the 'outcome-determinative' test by treating it as an automatic trump card for any state rule that could conceivably affect the result, which was never the intended scope of the Erie doctrine
Plumer argued that under the Erie doctrine and the Supreme Court's earlier decision in Guaranty Trust Co. v. York, federal courts sitting in diversity must apply state law whenever the choice between a state rule and a federal practice could determine the outcome of the case. Since the Massachusetts in-hand service requirement could determine whether the lawsuit proceeded at all, it was outcome-determinative and should control.
- The Massachusetts in-hand service statute was an integral part of the state's law governing claims against estates, and its purpose was to ensure executors received actual personal notice of lawsuits
- Applying the federal rule instead of the state rule would produce different outcomes depending on whether a plaintiff chose state or federal court, encouraging forum shopping — exactly the evil the Erie doctrine was meant to prevent
- The outcome-determinative test from Guaranty Trust required federal courts to follow state rules whenever choosing the federal alternative could change the result of the litigation